Weak current College】 【in-depth analysis of the various screen-projection-Power By】 【China power house network.

<br> Projection screen for projector, is one of the most important of the annex, that they are in pairs, a good projector wants to get good results in the need for a good screen to mix. As the saying goes, a good horse .with good saddle, a good projection screen will enable projection screen produces a qualitative leap. We watch the picture directly manifested through projection screen, the screen brings the viewer feel is vital. Projection screen and projector is a complementary, mutually reinforcing relationship, the right .projection screen and projector will make the picture more beautiful eye-catching, obtain a multiplier effects. This article from the projection screen of classification, by understanding the classification of the projection screen, according to the actual applications to choose the right projection screen. < .br> Classification by screen size <br> Select screen, you first need to determine the size of the dimensions of the projection screen depends primarily on the use of space and the number of viewers, as well as the location of the installation. The first .principle is to choose the right audience projection screen, instead of selecting the right projector screen. Currently most used in the projection screen size 80 ~ 120 inches, the largest screen has reached the size of 30 metres wide, medium-sized conference rooms in General .and family selection around 100-inch projection screen can meet. <br> On the projection screen of the installation location, there are also some values may be available for reference. Projection screen height best slightly higher than the viewer's eye level, projection screen at .the front of the audience from the distance can be set at 2 times the screen height in horizontal, high-brightness of the machine may be appropriate to increase the bottom edge of the projection screen may generally be ground distance of 50 to 80 cm. At .the same time, the size of the projection screen size to consider projector brightness, contrast, projection distance and other parameters. <br> <br> Press the aspect ratio of the projection screen classification <br> Means the screen's width and height of the .ratio, the more common with 4: 3 and 16: 9, but also have a 1: 1 and 1.85: 1. The aspect ratio of the screen according to the needs of different projection equipment to match. Typically home video projector with 16: .9, general business education conference presentation with 4: 3. <br> <br> Press material classification: <br> Projection screen is usually divided into positive projection screen and projection screen. As the projection screen is divided into soft screen and hard screen .soft screen including a white screen, Pearl screen and metal screen, hard screen includes a flat screen and curved screens, rear projection screen can also be divided into soft screen and hard screen. Most of them are cast curtain is soft screen rear-projection screen .is mostly hard screen. If the projection used location relatively fixed, then the optional in-wall, hang hanging from the ceiling-or three-legged stand-projection screen, if you need to frequently move projection, portable projection screen will be the best .choice. Different projection screens have their good and bad points, should be based on the usage environment to select specific can refer to the following table. <br> <br> Type principle advantage defects cloth curtain belong to non-screen when a significant number .of people to a greater extent to watch the image projection image, also all in the room where you can obtain the same brightness, white screen can do not get sufficient clear screen, and the desired room shade better glass bead screen in fiberglass, sturdy base .cloth, cohesive particles made of glass beads. Belong to the regression-projection screen: it has signs of optical characteristics. Maximum radiation strength to return to the light source (projector) can be the brightest brightness to the incident location reflex optical axis with the .projector into left 20 to 30-degree angle, the image of a white projection screen to appear on. The angle of incidence increases with projector, projection screen glass beads will be reduced back to your point of view of harmful light silver Pearl screen is reflective .projection screen this type provides the largest radiation strength, like a mirror reflects light. Projection screen gain and diffusion is interactive. If insufficient light diffusion, you can get higher screen gain value prone hot spot. This screen is uneven density, thereby leveling the affected .metal curtain in the base cloth adhesive aluminum coating made with this screen can be 2 to 4 times bright screen, similar to mirror features: exit angle equal to the angle of incidence in metal arc curtain when smaller room installation projector, regardless of the ground installation .or installation, using aluminium curved curtain can be very bright picture with narrow directional, it produces a limited number of viewable area projection hard curtain consists of three parts: diffusion Board, fees kerzhner lens, bi-convex lenses <br> <br> < .br> <br> Diffusion plate: acrylic plates joined diffusion agent, have let people's eyes to see the light of the role of image brightness, resolution can be filled with the whole screen, this screen with black stripes that can block light scattering, produced .out of high-quality high-contrast image fee kerzhner lens: a light set the direction of the people, reduce the screen Center and surrounding brightness differential of double-convex lens: has the role of improving the field angle <br> <br> .<br> <br> From the institutional distinction between the projection screen <br> Projection screen in addition to materials on the different types, from institutions can also be divided into the following: institutions type explains considerations for strength roll l spring bodies this is .a typical intensive projection screen that can be fixed to the ceiling or the wall of the above, you can pull down when needed. Some models have completely withdrawn when reducing vibration function. Note check the screen drop-down is smooth, whether stops. Note .the selection on the following will not produce a "V"-shaped bulging of the projection screen. Vertical volume litre-the projection screen is portable. Mainly used for large screen projection. The screen to use more convenient. You should check the mounting surface .and storage conditions, since such type of projection screen need side has a supporting organization. Furniture built-in type such projection screen can be integrated into furniture, as front-projection screen. It is especially suitable for home or Office use. Some of the .screen when you don't have time, you will find their way, but this kind of projection screen for the furniture, you can avoid this problem. This screen you can use the remote control or put down, this in turn enhances its functionality. .Border surveillance structure for this type of projection screen surface with a rope or a spring along the circular frame pull down projection screen and form, it can guarantee the flatness of the projection screen. If you need to carry or store user should not use this type .of screen.